Additional volumes capability (#736)

* Allow additional Volumes to be mounted

* added TargetContainers option to determine if additional volume need to be mounter or not

* fixed dependencies

* updated manifest additional volume example

* More validation

Check that there are no volume mount path clashes or "all" vs ["a", "b"]
mixtures. Also change the default behaviour to mount to "postgres"
container.

* More documentation / example about additional volumes

* Revert go.sum and go.mod from origin/master

* Declare addictionalVolume specs in CRDs

* fixed k8sres after rebase

* resolv conflict

Co-authored-by: Dmitrii Dolgov <9erthalion6@gmail.com>
Co-authored-by: Thierry <thierry@malt.com>

charts/postgres-operator/crds/postgresqls.yaml

@@ -74,6 +74,28 @@ spec:
             - teamId
             - postgresql
           properties:
+            additionalVolumes:
+              type: array
+              items:
+                type: object
+                required:
+                  - name
+                  - mountPath
+                  - volumeSource
+                properties:
+                  name:
+                    type: string
+                  mountPath:
+                    type: string
+                  targetContainers:
+                    type: array
+                    nullable: true
+                    items:
+                      type: string
+                  volumeSource:
+                    type: object
+                  subPath:
+                    type: string
             allowedSourceRanges:
               type: array
               nullable: true